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Marlins Web Site
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Date: 4-8-2022
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Number of Hours: 16.00
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Manual Reference: Sec 12, DWG 45
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Brief Description: Installing the Cowling Piano Hinges (Cont.)
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I finished installing the rivets on the bottom cowling and then started on the top. Alignment was very critical, so I duct taped the top to the bottom, then drilled the upper cowl hinges, disassembled, deburred the hinges, redrilled with #30 drill-bit, counter-sinked the cowlings, and riveted. In order to get a good backing support for drilling the holes, I cut a small 2x4 support brace and taped it to the #3 and #4 cylinder-head covers. It helped a lot. Even though I braced the hinges when I drilled them, the hinge pins in the aft part of the fitted cowling were very tight. I removed both of the cowlings and redrilled the hinge pin holes in the aft part of the cowlings on both sides. I lightly sanded the hinge pins with Scotchbright to get them as smooth as I could. Then I slathered the insides of the hinge pin gromets with Boelube (a type of wax made by Boeing Aircraft), inserted the hinge pins by attaching a drill and twisting the pins into the gromets. Next, I slowly pulled the pins out while redrilling the gromets, one gromet at-a-time. The pins go in better, but I will still need to work on them by re-accomplishing the Boelube process.
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Redrilling the Hing Pin Holes
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Rivets Installed
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Drilling Brace Taped to #4
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